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为考察空气节流对超燃冲压发动机燃烧室的影响,非定常数值模拟和地面实验相结合证实了空气节流可以实现超燃燃烧室燃料稳定燃烧,研究了节流位置、节流流量、节流撤去时间对节流效果的影响。结果表明:在燃烧室入口马赫数2,静温548.8K,静压101555.9Pa条件下,745mm处节流时,激波串稳定时间较短,稳焰失败;875mm处节流时,火焰稳定成功。随着节流流量和节流撤去时间的增加,燃烧越来越剧烈,壁面压力逐渐升高,可能影响进气道的起动,对于本文来流条件,30%入口空气流量作为节流流量是合适的,440ms以前撤去空气节流是恰当的。
In order to investigate the influence of air throttling on the combustion chamber of scramjet, the unsteady numerical simulation and the ground test confirm that the air throttling can achieve stable combustion of the fuel in the scramjet. The effects of throttling position, throttle flow, Effect of flow withdrawal time on throttling effect. The results show that when the throttle at 745mm is throttled at a Mach number of 2, static temperature of 548.8K and static pressure of 101555.9Pa, the stabilization time of the shock wave string is short and steady flame fails. When the flow at 875mm is throttled, the flame is stable . With the increase of throttle flow and throttling time, the combustion is more and more severe, and the pressure in the wall gradually increases, which may affect the intake port start-up. For this flow condition, 30% inlet air flow is suitable as throttle flow The removal of air throttling before 440ms is appropriate.